SA04250245B1 - Thin strips or plates made of A1FeSi alloy - Google Patents

Abstract

Abstract: The present invention relates to foils or thin strips of thickness between 6 and 200 micrometers, obtained by means of an alloy of the following composition (by weight%): Si = 1.0 to 1.5, Fe: 1.0 to 1.5, Cu < 0.2, Mn < 5.1 and other elements each < 0.05 and the total < 0.15 and the rest Al, when annealed we have tensile strength Rm >110 MPa with respect to thickness >9 µm >100 MPa for thickness 6 to 9 µm, yield strength 6-R5 > 70 MPa, preferably silicon content in the alloy between 1.1 and 1.3% and iron content between 1.0 and 1.2%. The foils or thin strips according to the invention are particularly suitable for the manufacture of multilayer compounds, bottle caps or aluminum wrap.

Description

Y — _ thin strips or plates made of alloy 411681 Full description

“a 1 0 except a a a p

The present invention relates to foils or thin strips of LS less than 001

micrometer preferably less than 00 µm; Where it is made of an alloy of aluminum

alloy of aluminum ¢, iron, iron, silicon + and free of manganese from Lalas m LS cmanganese that it relates to a method for producing that metallic foil or strips. maybe

Obtaining these strips through the traditional semi-continuous casting of panels or through

Continuous casting, for example continuous casting between belts (double belt casting) or between

Cylinders (double casting) cylinders

The field of manufacturing metallic paper (foils) consisting of alloys of aluminum a sie sf) 0 tends towards continuing to decrease the oll used in the application of water, noting that this requires specifications

High mechanical and better formability.

Le alloys, which contain a very small percentage of manganese, are used in

Jie ¢ thin foils 8111 alloy containing composition (wt)

> Cu “V,” — but Fe Ara — 1: Si: aluminum Registered with the Aluminum Society 0 < Wata 0 Vo

The presence of manganese makes it easy to crystallize after the last annealing process

final annealing; However, the fracture resistance is still insufficient for less than 100 micrometers.

_Y—

It is therefore important to develop new alloys and/or to optimize conversion ranges

degree to meet market requirements.

in order to increase the mechanical strength; sale is added manganese « eg ingot

calloy 8005 where the composition registered in accordance with the Aluminum Society is as

0 follows (7 by weight):

.A1 < Mg), Ye H Ab Rasa: Cus «Y,+=\,Y Fey¢e, tv > 1

The addition of Manganese actually hardens the material. According to the patent applicant

US 6,517,646 Mechanical specifications obtained with a chip having the composition Si perform

= Atdl Fey = Aral Cus = Ek /+,¥V=Mny Rala = Teal Tig = eA, ...m2 in combination with the preferred conversion range; to get the Ry value of 103

8 with a thickness of 0.7 µm.

The mechanical properties can also be improved by adding a small amount of manganese to the

Series 8000 alloys, which have a proportion of iron. The patent applicant 02/64848 WO

(Alcan International) described the production process by continuous casting of thin sheets of AlFeSi ve alloy containing 10.7 to 1.7 Fe and 1.75 to 70.8 Fe of 51. is obtained

On high mechanical strength by adding a percentage of manganese ranging from 0.007 to 76.07

to the slug. This proportion of added manganese is required to obtain particle size

Small after the final annealing process.

This is how manganese seems to be an element that helps to increase the mechanical properties of alloys 8000, however; Manganese in the form of a solid solution or precipitated fines can prevent or inhibit the recrystallization process during final annealing. Therefore it is important to carefully control the sedimentation of the manganese-containing phases during each step of the banding; Which we can't be hard. Any deviation in the transformation range results in many consequences related to the effectiveness of the final annealing. Therefore, it is of great importance to develop an alloy that does not contain manganese; With distinction at the same time high mechanical specifications. US 5,503,689 (Reynolds Metals) describes a method for producing a thin film of alloy 0 having a ratio of 170 to 71.1 of 81 and 4601 to 71.0 of Fe and less than J, YO of Cu and less than 701.1 of Mn; By continuous casting and rolling on LW cold rolling without an intermediate annealing process. The preferred contents of fron and silicon are 01 silicon and Jo. The patent was described US 5,725,695 ( Reynolds Metals) has the same range of composition; an intermediate annealing of 10 is carried out at a temperature range of 4060 to 4460°C (750-870°F); and a final recrystallization annealing at 0060°F. SiWe greater than or equal to .1 in examples; maximum fracture strength Vo is 10170 mPa (psi); maximum elasticity is 9.1 MPa (0TAY) pounds per square inch) and the length is 791.27 and the thickness is 1 pound

μm (Te, YAS) These mechanical specifications are again kept low in some applications. With regard to alloys (did) alloys, it is often necessary to perform a high-temperature heat treatment process (all of the seriousness of insulation operations); Via sale) e adsorption of sedimentation groups and homogenization of the thickness structure. The effect of homogenizing at 6000 °C has been described for alloy 8011 alloy (with composition Fe [VV] and non-purity Rb7S and/of Mn and 5/98.7 (Al) obtained by double-roller alloying. "Centerline Segregation in a Twin-Roll Cast 8011m Alloy" as in the article Cylinders Aluminum VE aluminum 1994 p. ©71-”18” A modification is made in the sedimentary phases © .with a reduction in the proportion of non-concrete materials Reducing the central dielectric thus leads to the possibility of determining the porosity of the ultra-thin metal sheet and improving its formability.It is economically important to determine the degree of heat treatment.For alloy 8111 with composition: Lani L,Y Fe aq Mn > CBRb Zng > Arb Cuy > 7 Onset of phase transformation and total recrystallization is observed from 470°C; although annealing 0 at a temperature of 0560© to 080°C is necessary for further transformation

M.Slamova et al,”Response of AA8006 and AA8111 Strip-cast Interpolation to Its Elements (See “Rolled Alloys to High Temperature Annealing”, ICAA-6, 1998). alloys without manganese manganese In addition, in the conversion process that follows homogenization, with respect to a decrease of Cll of normal 0 perform an intermediate annealing step in order to anneal the metal

_ 4+ — Soften the metal. As for manganese alloys; Controlled intermediate annealing generally requires a heat treatment degree of Ale temperature (above 5060°C) to undergo recrystallization. For Type 8000 alloys that do not contain manganese; It is conceivable to conduct a heat treatment at a lower temperature than the alloys of type 8006. a

The patent application Wo 99/23269 (Nippon Light Metal and - Alcan International) describes a method applicable to alloys 817851 with a ratio of 17 to 71 Si and 7 to 71.7 Si. Fe where the ratio of Si/Fe is in the range from 1.4 to Le LY that the intermediate annealing is performed in two steps; The first step is made in

0 Range (Vo 490 ° C Lap) The second step is performed in the range 00060 to 0 ° Lay she This method aims to reduce the inclusions of paper (Sad) on the surface.Not done Mention the mechanical specifications. The objective of the present invention is to obtain metallic Gus foils or thin strips of AlFeSi alloy without adding manganese + with its high mechanical strength;

and maintaining a good possibility of formation” and bearing the economic burdens for that as much as possible. GENERAL DESCRIPTION OF THE INVENTION The present invention relates to a sheet of thin foil of thickness from + to 'Yoo μm', preferably from + to 50 μm; Made of an alloy having the composition (wt. 7):

Yai

Fes « Vy, o—Y, 1 Bahra « Mn «+, 1 > Cuy > Libf and each pale of other elements < 0.06 in total < 10 where the remainder is Al and preferably in the range SifFe 5 0,40 where it has a fracture strength of 011 Ry > 011 MPa for a thickness of > ? 3 μm < Yoo MPa for thicknesses from 4 to 9 μm. Pres 0 sheet metal with RO. elastic limit (measured by sheared samples) >7 MPa. The length at the joint exceeds the following Gay values for the sheet thickness. Thickness (micrometer) | Greater than (7) and greater than better The alloy should preferably have a silicon ratio of 1.1 to 0.7 and an iron ratio of 1:08 ranging from 01 to JNY The present invention also relates to a method for producing thin strips of thickness less than 0 μm Yor made of an Al-Fe-Si alloy having the composition (7 by weight): Si 16-19 p] : Cuy > Art 1 > Mn and the total remaining elements are less than 0.19 dua each element is less than nee so the remainder is aluminum ¢ in 1.550 > 5/78 Als as

um - better; It also includes the preparation of a first slice either through the semi-continuous slab vertical casting process; or continuous casting followed optionally by hot rolling; And cold rolling of this first slice to the last thickness with annealing (final annealing) of its medium, which is optionally conducted in a period ranging from Yo JY an hour at a temperature that also ranges from 7900 to TO. Celsius; Preferably from 780 to 30 degrees Celsius with a final annealing procedure at a temperature ranging from 0019 to TV. Adie degree Detailed description Foils or thin strips are produced according to The invention is made of AlSipe alloys 0 8000 practically free of manganese; Where its content is typically less than .261 the contents of iron and silicon are significantly higher than those of alloys 8011 and 8111; Which are AlFeSi alloys for foils without the manganese that is used in general. The preferred range of composition is an alloy 5111608 with a silicon ratio of 71:1 to 71.7 and an iron content of 0 00 from 70.1 to JNY Preferably for alloys According to the present invention the average contents of silicon and iron are of the order > 95,.. The alloys have mechanical strength in the annealing (Ala) 0) which is unusual for alloys of the present composition; It also has a fracture strength of > 011 MPa or up to 116 MPa for thicknesses greater than 9 µm and 0-100 MPa for thicknesses from + to 9 µm dag Flexibility at 70.7 ¢ >0 Rep MPa .

and - such high mechanical strength is not obtained at the expense of formability; Compared to alloys 8011 and 8111; where they have the same lengths; With increasing values of burst pressure. These high mechanical specifications are also obtained for the strips resulting from the panels that are obtained through the traditional semi-continuous horizontal casting and hot rolling (cold rolling), as well as for the strips that are obtained through continuous casting, belt casting, or casting Double-cylinders, as the continuous belt casting is followed by hot rolling. Strips that are hot-rolled or strips that have not yet been cast are optionally subjected to homogenization at a low temperature. (between £00 to oer 0°C) to reduce centripetal segregation which may be the reason for the low formability in the final thickness. This low-temperature heat treatment process is sufficient to resorb any of the centrifuges in alloys that do not contain manganese. The strips are then cold rolled; For final thicknese or intermediate thicknese between 1.5 and © mm; These strips Ve are glad for intermediate annealing unlike the strips that contain manganese » It is possible to perform this intermediate annealing process at a low temperature ranging from You to TO is a percentage; preferably 80 to 40°C; for a period of more than two hours. heat falls it; mentioned in the references; In particular the patent application WO 064848/02 mentioned above; In the normal range exceeding −1°C. EAR

- 1.0

The applicant has found that applying a low-temperature heat treatment to the AlFeSi alloy

specific to a combination such that 5:78 > 0.95; With no intermediate annealing

Annealing Finally, as far as possible technically, leads to a significant improvement in mechanical strength; in the rate of

ho on WJ compared to the usual intermediate annealing. 0 This greater mechanical strength is obtained with improved formability which is measured by burst pressure or

Maximum height in accordance with ISO 2758

The final annealing is performed at a temperature ranging from 700 to 7760°C.

for a period ranging from one hour to VY hours. The annealing periods are controlled by quality

Obtain foils removal. A fine-grained composition is obtained after 0 annealing procedure nb where the average particle size decreases; which is measured by analyzing the image below

electron microscope; on ? micrometer.

The combination of low-temperature homogenization or no-homogeneity and intermediate annealing has been proven

Intermediate annealing low temperature or separating each ld is preferred to obtain volume

My grain is accurate in addition to being of a simple economic cost. The particle size is reduced by approximately AT ve compared to heat treatment processes at a higher temperature; lead to an increase

RPG Roz mechanical specs which are related; To obtain ALB values from fish; number of limits

The granules. This increase is not obtained at the expense of length; Because the number of particles increased

The thickness also leads to a reduction in the risk of local loss in one or two granules

Obtain foils thickness.

_ \ \ —

These foils of the present invention are particularly suited to applications where both good mechanical strength and higher formability are required; For example; for the production of sae Gai layers and especially for fresh produce packing seals; Or covers or household aluminium.

Examples Example 1 for the purpose of showing the effect of alloy composition; Two strips of length 6.1 mm made of alloys A of the present invention and B of type 8111 were produced; They have the composition shown (7 by weight) in Table OV by casting double-cylinder reylinders.

1 Table 1 ah aq al ss al al aes 1 s ore] eel | |] How thick is it? mm and then subjected them to cold rolling annealing. The two strips were then cold rolled. Asie Aad 701 was then rolled for an hour in intermediate annealing daw sie YA in several passes to reach the final thickness to cold rolling. The two slides were cold-cold at °C.YY for 0 hours in final annealing, after which they were subjected to a final annealing.

_ 1 Y —

in each case; Mechanical specifications measured: fracture strength, Ry (MPa); Conventional modulus of elasticity at 70.7 80.2 and length A (in percent) according to standard 546-2 007-587 and bursting pressure with Pe of air (in kPa) according to standard 2758 150 and maximum height Hd (mm). The results are shown below in Table 7:

0 table?

Alloy Ri, tears!)7( Hd Pe allo (MPa) | (MPa) (kPa) ol lew lw

It has been proven; Unlike alloy type B 8111), the fracture strength of the alloy A was higher than 110 MPa, and the flexibility was higher than 71 MPa. The bursting pressure and length were both large, so this alloy was strong and could be shaped as well.

1 Example - 0 by 1 A according to the example alloy Made of alloy 1.7 with a thickness of strip A strip was cast The strip was then rolled Cylinders by double-cylinder continuous casting For the process of annealing a strip to a thickness of mm. Then subject part of the slice cold rolled to a degree Celsius. One of this kind was subjected for 0 hours in an ordinary medium alloy of © sad according to the present invention intermediate annealing Jaw sia of the chip to anneal the AV part vo

hours in TY degrees Celsius. The parts of the strip were then cold rolled in several passes to reach a final thickness of 01.69 micrometers. They were then subjected to final annealing pal for 60 hours at 0/77°C. The same specifications Ji as those shown in Table 1 were measured; their respective values are listed in Table 0: Table ? Annealing medium Hd (mm) Pe (7) Ro» R,, (MPa) | (MPa) (kPa) as’ that lowering the intermediate annealing temperature simultaneously led to an increase in mechanical strength; length, explosive strength and formability. It was of medium granular size; la, for SEM image analysis no µm to perform annealing at 0 #st annealed at 07 °C 5 y,¥ µm to perform annealing at YY. µm. Therefore, the increase in the mechanical specifications of low-temperature annealing was associated with the reduction of the particle size obtained after final annealing.

Claims (1)

— ¢ \ — elements of protection 1-1 foil or thin strip of thickness from 1 to 001 “Sia Soe Y preferably from + to 90 µm; Made of an alloy having the formula (wt. 7): ‘Fes ¢),0—Y,. 1 3 by sea Cu > Art Mn > Rg and each of the other elements < 0.05 with a total of > 0.15 where the remainder is Al 1 where it is characterized by resistance to fracture in the case of annealing 011 > Rp annealing MPa No for thicknesses >1 µm and Yoo MPa for thicknesses from 1 to 9 A µm. 1 - Foil or thin strip according to the element of protection (Cus) Y, characterized by fracture strength in Ala annealing M1 > 111 MPa for a thickness of < 1 μm. 1 *- Metallic foil or strip “Lal according to the protection element of any of the Y protection elements 1 or oF, as it is characterized by a flexible limit in the case of RO annealing.; annealing > 00 v MPa. 1;- foil or thin strip according to the claim of any of the 0 claims from 1 to; where it is characterized by a length at interval a; As a function of thickness: f 1 - z t (μm) better Te z z z z 1 0— foil or thin strip depending on the claim of any of the 1 claims to 4; It is characterized by the fact that the alloy has a composition such that 5:/6 v < 0 1 1— foil or thin strip according to the claim of any of the claims 1 through 5; It is distinguished by its silicon content ranging from 71 v to 70.7 and its iron content ranging from 70.0 to JNY | A method for producing Jb thin strips with a thickness of about 1 micrometer Y made of Al-Fe-Si alloy having the composition (4 by weight): Si salt Mny 7 > Cus ¢),0 -), 0 Fe 3 < )0> and the total of the rest of the elements is less than V0 ¢ where each element is less than 0.06 so that the remainder is aluminum ¢ and ° it also includes the preparation of a first strip either through the casting process Vertical 1 for semi-continuous sheets; or continuous casting optionally followed by hot (chot rolling) and cold rolling (7) for this first strip to A is the last thickness with its intermediate annealing which optionally takes place 4 at a temperature also ranging from You to You degrees Celsius; “0 preferably from 780 to 40°C with el a) final annealing 1 at 001 to TV°C. —A 1 method Uy of protector oF where it is characterized by the fact that the alloy has a composition such that Y is SifFe > F 1 5- a method according to either of the protection elements 1 or A where it is characterized by that before duly) 7 is performed on Cold rolling: the first strip is subjected to v homogenization at a temperature between 4900 to 9000 ° C. -1 0 method according to any of the protection elements from 7 to 9, where It is characterized by the fact that the Y strip is prepared by continuous casting between cylinders.